Suppose that an accelerating car goes from 0 mph to 54.5 mph in five seconds. Its velocity is given in the following table, converted from miles per hour to feet per second, so that all time measurements are in seconds. (Note 1mph is 22/15 feet per sec = 22/15 ft/s.) Find the average acceleration of the car including units. t 0 1 2 3 4 5 v(t) 0 27.272 47.272 61.816 72.728 80 Average acceleration over the first second = Average acceleration over the second second =